As Peter Fimrite reported in the San Francisco Chronicle, this week a lone gray wolf (Canis lupis) crossed the border from Oregon into California.  This marks the first time since 1924 that a wolf was seen in California.  The species was hunted to extinction within the state, due at least in part to concerns about the risks it posed to humans.  The species is listed (pdf) as endangered under the federal Endangered Species Act.  It is not listed under the California Endangered Species Act.